Internet is full of formulaic, quasi-religious conversion stories like this. A crucial element of this genre is the idea that the listener (who had the epiphany) used to be a cable skeptic. This element is used to increase the credibility of the story ("even my wife could tell the difference" is another example the popular cliches).Anyway, to make a long story short, I'll never forget the column in which Mike Silverton reported his experiment with different speaker cables. For many years he'd denied the possibility that speaker cables could make a difference. There was NO WAY they could. It was *impossible* from an electrical engineering standpoint and from a commonsense point of view. Snake oil. Utter BS.
I don't remember what the subject speaker wires were - they might have been silver, for heavens sake - but he was honest enough to admit that he'd been wrong and that, in fact, speaker wires made a difference. A "huge" difference, for him. I appreciated that he was humble enough to admit that he'd been wrong. Though I've never, in fact, done much experimenting with wires.
But sadly, what actually happened was just another sighted test, with zero value.